post/pool versions: fix database timeouts not being set.

Bug: database timeouts were set only on the main database, not on the
post and pool versions database, so users effectively had an unlimited
timeout when dealing with these things.

app/controllers/pool_versions_controller.rb

@@ -1,6 +1,7 @@
 class PoolVersionsController < ApplicationController
   respond_to :html, :xml, :json
   before_action :check_availabililty
+  around_action :set_timeout
 
   def index
     if params[:search] && params[:search][:pool_id].present?
@@ -23,6 +24,13 @@ class PoolVersionsController < ApplicationController
 
 private
 
+  def set_timeout
+    PoolArchive.connection.execute("SET statement_timeout = #{CurrentUser.user.statement_timeout}")
+    yield
+  ensure
+    PoolArchive.connection.execute("SET statement_timeout = 0")
+  end
+
   def check_availabililty
     if !PoolArchive.enabled?
       raise NotImplementedError.new("Archive service is not configured. Pool versions are not saved.")